Area of a circle: pi times radius squared
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A 1.25-inch diameter circle contains 1.227 square inches.
The area of a 5-inch circle is: 19.6 square inches.The area of a 4-inch circle is: 12.6 square inches.The area of the 5-inch circle is 55.6% larger than the 4-inch circle
A 4.75-inch diameter circle contains 17.72 square inches.
A 20-inch diameter circle contains: 314.16 square inches.
The area of a 14-inch circle is: 153.9 square inches.